使用 ReactJS ES6 实现 Socket.io [英] Implementing Socket.io with ReactJS ES6
问题描述
我在将 SocketIO 客户端合并到我的项目中时遇到了麻烦，因为我以同构方式设置了项目.在我的基本 html 中包含套接字文件后，我尝试在我的一个组件的 componentdidmount 中调用 let socket = io(); 但是最初在我的控制台中记录它之后它是未定义的.当我路由到另一个组件并使用该套接字变量返回到该组件时，它会填充一些数据.我想我的意思是它没有在我的组件中初始化套接字是什么，它似乎必须等待我如何解决这个问题?
I'm having trouble incorporating SocketIO client into my project as I have me project set up isomorphically. After including the socket file in my base html, I try to call let socket = io(); in the componentdidmount of one of my components however initially after logging it in my console it is undefined. When I route to a different component and comeback to that component with that socket variable then it becomes filled with some data. I guess my point here it isn't initializing in my component what socket is, it seems like it has to wait how do I work around this?
组件.jsx
componentDidMount() {
let socket = io();
console.log(socket);
}
Base.html
<!doctype html>
<html lang="">
<head>
<title>TITLE</title>
META
LINK
</head>
<div class="app">CONTENT</div>
<!-- Google Analytics: change UA-XXXXX-X to be your site's ID -->
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-XXXXX-X', 'auto');
ga('send', 'pageview');
</script>
<script type="text/javascript" charset="utf-8" src="/assets/app.js"></script>
<script src="/socket.io/socket.io.js"></script>
<script>
var socket = io();
</script>
</body>
</html>
顺便说一句，这在我从服务器连接时工作得很好，它发出用户正在连接和断开服务器的信息，只是客户端操作让我感到困惑.
This works fine btw I for stuff like on connect from the server, it emits that a user is connecting and disconnecting off the server, just the client manipulation has me puzzled.
推荐答案
可能还有其他解决方案，但以下对我有用:
There are likely other solutions, but the following works for me:
1) npm 安装 socket 客户端包
2) 将 socket 导入到所有需要 socket 功能的组件的最根组件中
2) import socket into the most root component of all components that need socket functionality
3) 在生命周期事件之一 (constructor/componentWillMount, componentDidMount) 中连接服务器端套接字事件监听器
3) hookup server side socket event listeners in one of the lifecycle events (constructor / componentWillMount, componentDidMount)
4) 如果在子组件中处理某些服务器事件有意义，则通过 props 传递套接字对象
4) pass down socket object through props if it makes sense to handle certain server events in child components
示例:
import io from 'socket.io-client'
let socket = io(`http://localhost:8000`)
class App extends Component {
state = { data: {} }
componentDidMount() {
socket.on(`server:event`, data => {
this.setState({ data })
})
}
sendMessage = message => {
socket.emit(`client:sendMessage`, message)
}
render () {
return (
<Child
socket = { socket }
sendMessage = { this.sendMessage }
/>
)
}
}
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